在三峡左岸大坝与电站一期开挖工程中应用了预裂爆破技术。文章阐述了预裂爆破的设计原理和施工方法，对现行预裂爆破参数的计算公式及经验数据提出了看法，总结了形式更为简单的经验公式。它的成功经验不仅可以在三峡石方钻爆开挖中普遍推广，而且也可以供其它工程借鉴 In the left bank of the Three Gorges Dam and the first phase excavation project applied pre-cracking blasting technology. The article expounds the design principle and construction method of presplitting blasting, puts forward the opinion of the calculation formula and experience data of the presplitting blasting parameter, and sums up the empirical formula with simpler form. Its successful experience can not only be widely promoted in the excavation of the Three Gorges rock drilling, but also can be used for other projects